Improvement



w. o. FIETZ,

Cornet.

No. 215,598. Patented May 20,1879.

UNITED STArns PA'rEN'r OFFICE.

VILHELM O. FIETZ, OF BOSTON, MASSACHUSETTS.

IMPRGVEMENT IN CORNETS.,

specification forming part of Letters Patent No. 215,598, (la-ted May20, 1879; application filed Januaiv 29, 1879.

To all whom it may concei'n:

Be it known that l, VILHELM O. FIETZ, of Boston, in the county ofSuffolk and State of Massachusetts, have inrented certain Improvenientsin VVind-lnstruments, of which the following` is a specification.

This invention relates to that class of windinstriments employingpistons for varying the length of tubing through which the wind passes.A familiar type of this class is the cornet-a-piston; and niy inventionhas especial reference to this instrument, though it is adapted to anyof the class named.

The object of my invention is to provide certain im proveinents in thearrangeinent of tubes, whereby the length of movement of the piston isreduced to the minimum and the air is prevented from being` wasted, andpure and even tones are produccd.

To these ends my invention consists in the iinprovenients which I willnow proceed to describe and claim.

Of the accompanyingdrawings,forn1ing a part of this specification,Figure 1 represents a side view of a cornet embodying my invention.Figs. 2 and 3 represent sections, showing` the piston in differentpositions. Fig. 4 represents a perspective view of a portion of thetubing detached from the rest of the instrument.

Similar letters of reference indicate like parts in all the figures.

ln the drawings, A represents a cornet, and B B B the tubes or casingscontainin g the pistons. O U1 OZ C3 represent the portions of tubingthrough which the air passes when the pistons are in their normalposition.

D D D represent the branch or extension tubes through which the air iscaused to pass by the displacement of the pistons from their normalposition.

The tube enters the first casing B, the tube 01 connects the first andsecond casings B, and the tube G2 connects the second and third casingsB, as shown. The tubes O O2 enter the casings B laterally, and the upperends of the tubes D enter the casings B at points directly opposite thetubes O O2. Said tubes D extend around, and their low r ends enter, thecasings B immediately under and in line with the tubes O C2.

E represents one of the pistons,which is similar in construction to allthe others, and is coinposed of a tube or body adapted to fit snugly andslide freely in its tube B, and is provided with two air-passages, a b.

The passage a is straight and cylindrical, and extends directly acrossthe piston, and connects the tube O or O2 with the upper end of one ofthe tubes D when the piston is displaced, as shown in Fig. 3.

' The passage Z) connnences in the side of the piston close to one endof the passage a, and is curved (lownwardly and extends longitudinall;of the piston to the lower end of the latter, and connects two of thedirect air-tubes together when the piston is in its normal position, asshown in Fig. 2, the piston meanwhile shutting off the tube D from thedirect airtube.

The passages a b are entirely separated from each other Within thepiston. The construction of the piston, however, is not a part of myinvention, the same construction being common in twin-valve instruments,as shown in English Patent No. 558 of 1855.

The close proximity of the tubes O C2 to the tubes D D D enables thepiston to perform its described functions by a very short movement;hence less friction attends the operation of the piston, and it can bemade shorter than those heretofore in use.

By the described arrangenient of the tubes O, O2, and D in connectionwith the construction of the valves, am enabled to avoid waste or lossof wind, and con sequently produce pure and even tones.

I claim-- n a eornet or kindred instrument, a valvec-asing, B, havin g apiston or Valve constructed as described, iu combination with adirectairtube, O and 02, and an extension-tube, D, the upper end of theextension-tube entering the casing` directly opposite the directair-tube, and the lower end of the extension-tube entering the casing`directly under and in close proximity to the direct air-tube,substantially as and for the pnrpose specified.

In 'testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WTLHELM O. FIETZ.

Witnesses:

JULrUs ELsoN, O. F. BROWN.

